61 Dynaflow switch pitch stopped working after rebuild. No longer goes into high stall mode.

Discussion in 'The "Juice Box"' started by 67NorCalGS, Feb 5, 2021.

  1. 67NorCalGS

    67NorCalGS Well-Known Member

    I'm not sure if this is the right place or maybe classic Buick might be better. I had the trans rebuilt a few years ago only for leaks. Was working fine otherwise. So I can't take it back. Plus I moved. The switch pitch didn't work after the rebuild. I never noticed it until accelerating hard one day and then we moved shortly after. I have all the manuals, but thought someone might have some input on where to start? From what I understand these trans never shift unless done so manually. They accelerate off the torque converter.
     
  2. Matt Knutson

    Matt Knutson Well-Known Member

    I never heard of VP converters being used in cars previous to 1964. Perhaps you are referring to the kickdown function.
     
  3. LARRY70GS

    LARRY70GS a.k.a. "THE WIZARD" Staff Member

    Matt, the Dynaflow was the precursor to the switch pitch that was used from 1965-67.

    https://www.hemmings.com/stories/article/smooth-operator

    There were several versions of it.
     
  4. telriv

    telriv Founders Club Member

    The "Switch Pitch" was offered on the DynaFlow starting in 1955. When the pedal was at WOT the switch pitch worked in low & reverse also.
    One thing you DON'T want to do with a DynaFlow is shift from low to drive at WOT. Causes MANY BAD things to happen. In MOST DynaFlow equipped vehicles because of the lower, numerically, lower gears you could go threw the 1/4 mile mostly in low gear. I had a '57 Century that I won alot of money with. I could hold low gear until 110 MPH. Nobody believed it & would put a $20.00 bill on the front seat which of course I snatched up as soon as the speedo read 110.

    Tom T.
     
    Max Damage likes this.
  5. Max Damage

    Max Damage I'm Working on it!

    I bet the engine was screaming at that point! Great story Tom.
     
  6. Smartin

    Smartin antiqueautomotiveservice.com Staff Member

    Is the kickdown linkage hooked up and adjusted correctly?
     
  7. 67NorCalGS

    67NorCalGS Well-Known Member

    Hopefully that's all it is. I need to get the manual out. Was hoping someone might have had experience with these transmissions. I'm not sure it would be called a "kick down" per say when you are switching between high and low stall mode. Since it's a single speed transmission unless manually putting in low. I'm hoping it's not internal and something to do with fluid coupling or valving. I'm sure when I get the manual out I'll get an overall picture of what's taking place. Car is in storage right now, but will be home at the end of the month.
     
  8. LARRY70GS

    LARRY70GS a.k.a. "THE WIZARD" Staff Member

    Maybe this will help?
     

    Attached Files:

  9. Smartin

    Smartin antiqueautomotiveservice.com Staff Member

    I call it the kickdown because that's what it feels like. It's the stator control linkage.
     
  10. 67NorCalGS

    67NorCalGS Well-Known Member

    Awesome thanks! You're right that's exactly how it feels.
     
  11. 67NorCalGS

    67NorCalGS Well-Known Member

    Awesome thanks I'm reading it now. I do have my factory manual I'll dig out in a bit.
     

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